sarvastrair aksata-tvacah
tapah-austerities; sara-mayam-greatly powerful; tvastram-performed by Tvasta; vrtrah-Vrtrasura; yena-by which; vipatitah-was killed; anye-others; ca-also; api-indeed; bala-upetah-very powerful persons; sarva-all kinds; astraih-by weapons; aksata-without being injured; tvacah-their skin.